Skip Navigation

Special Steels

Main text

Chemical Composition and Heat treatment


 NACHI Chemical Composition (%) Heat treatment Hardness
C W Mo Cr V Co Mn Ni Si

Anne
aling
(°C)

Austeni
tizing
(°C)

Temp
ering
(°C)

 Annealed hardness
(HB)		 Practical hardness
(HRC)
Cold MCR1 Patent steel class 850-880
SC		 1050-1100
OQ		 500-600
AC		 Max255 55-62
MDS9 1.05   1.6 9.3 0.5         830-880
SC		 1000-1050
OQ		 500-560
AC		 Max210 55-62
SRM6 0.75   1.3 1.0     2.0     820-860
OQ		 150-400
AC		 54-60
ICS22 Patent steel class 700-850
SC		 900-950
Carburize OQ		 150-300
AC		 Max197 58-64
on surface
SC:Slow cooling OQ:Oil cooling AC:Air cooling
Page Top